Britney Spears has recently performed her new songs on both Good Morning America and Jimmy Kimmel Live, but now it appears the pop star wants to put on the brakes when it comes to her tour, according to The Sun UK.

A source tells the site:

Britney has told her management that she wants to push back her concert dates because she's not feeling ready. She doesn't feel she has enough time to prepare and has asked management to pull all her dates and postpone everything until later on in the year. She's a perfectionist and wants everything to be better than ever before."

Brit's Femme Fatale tour is set to begin on June 17 in Sacramento, but now she may not be hitting the stage until later this year. The source adds:

"She is having to compete with other huge female stars such as RIHANNA and LADY GAGA now so wants to step the show up. Obviously it's gone down like a lead balloon because venues and staff are booked and ready to go. They are trying to talk her round or at least hoping she'll consider going out in September."

Now that Enrique Iglesias has dropped out of the tour, Britney's opening act has yet to be announced.

Find out which R&B star Britney would like to tour with ... after the jump.

In a recent interview with MTV, Britney revealed Usher is at the top of her list as a possible addition to her tour. Those two together would sizzle!